Based on the Internet novel of the same and written by Yeo-ni Gui, “Do Re Mi Fa So La Ti Do” is a touching love story with bittersweet elements. Jung-won wears a funny dragon suit, while working at the amusement park, and pours soda on Eun-kyoo, because of his taunts.A short while later, Jung-won finds out that Eun-kyoo has moved into the house next to hers. Eun-kyoo now threatens to tell Jung-won’s parents that she works part time at the amusement park. To keep Eun-kyoo quiet, Jung-won agrees to carry his guitar for a week. Jung-won then starts developings feelings for Eun-kyoo, who is the lead singer in a band called Do Re Mi Fa So La Ti Do. Eun-kyoo also starts to develop similar feelings for Jung-won. The two soon become a couple.With an odd twist of fate, Jung-won goes to the bands rehearsal room and meets a familiar person from her past, a boy named Hui-won. Their relationship makes everything make more complicated. 10 years ago, Jung-won and Hui-won were close friends, but because of a personal matter stopped talking to each other completely. Jung-won is now surprised to learn that her ex-close friend is now best friends with her boyfriend. Will their relationships survive?

The love story of a single dad, Kang Poong Ho, who raises his 7 year old son alone after being abandoned by his first love, Yoon So Yi. By day he works as a pest exterminator and by night he is a martial artist. Jeon Ha Ri, is a medical student from a wealthy family who falls for Poong Ho. She secretly teaches Poong Ho's son, San, how to play the piano. Poong Ho's first love is also his son's mother who is a cold and proud woman who left her family to study abroad as a pianist. She was sponsored by Jeon Ki Suk who happens to be her fiancée and Ha Ri's father.

Immediately after coming off a suspension, Detective So-yung (Yoon-ah Song — Face) is thrust into one doozy of a case. Seems the victim died from acid. An acid released from inside his body. And this isn't the type of acid those crazy kids are fond of — the only trip these cats are taking is to the morgue.To make matters worse, there are a couple more men dying off the same way. There appears to be a serial killer on the loose, and the last thing the victims are seeing is a long-haired woman in black (with some freaky blood-shot eyes).Throw in a new partner and some crazy dreams and So-young has her work cut out for her.